You're quite correct about the Lack. They're cheap as hell (15 bucks at time of writing?), but as a result quite manipulatable, such as creating 3d printer enclosures [0]. You can see some of their insides as they go through the process.
Though I'm also going to point out that a LACK side table ($13 now) for 8 years is a rather good deal.
The internals are revealed on the Ikea page too: https://www.ikea.com/us/en/p/lack-side-table-black-brown-801...
Okay those cheap ones make sense, but for coffee table it is robbery...